better visual seperation between flake/non-flake version

docs/site/blog/posts/nixos-facter.md

@@ -37,8 +37,9 @@ Still in its early stages, [NixOS Facter] is intended to do what I've described
 
 A user can generate a JSON-based hardware report using a (eventually static) Go program: `nixos-facter -o facter.json`. From there, they can include this report in their NixOS config and make use of our [NixOS modules](https://github.com/numtide/nixos-facter-modules) as follows:
 
+=== "**flake.nix**"
+
     ```nix
-# flake.nix
     {
         inputs = {
             nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
@@ -58,7 +59,11 @@ A user can generate a JSON-based hardware report using a (eventually static) Go
             };
         };
     }
+    ```
 
+=== "**without flakes**"
+
+    ```nix
     # configuration.nix
     {
         imports = [